I currently have two exchange 2003 servers and one 2007 Exchange server. We are going to be killing the 2003 servers and migrating users to the newer system. The two 2003 systems have their own domains and I need to send an auto response for those systems stating that the old domains will not be valid after a certain period of time and to instead update contact info with the new address. I have spoken to the registrar in hopes that they could have done this but I am told that only we can as we host our own mail. Can this be done and how. Thanks in advance.